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cascade shadows

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This commit is contained in:
Masashi 2026-02-02 18:48:39 +05:30
commit f0708fdc15
7 changed files with 161 additions and 103 deletions
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32
engine/data/shader/shadow.fs
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@ -2,10 +2,14 @@
varying vec4 vPos;
varying vec3 vNrm;
varying vec4 vShadowCoord;
varying vec4 vShadowCoord0;
varying vec4 vShadowCoord1;
varying vec4 vShadowCoord2;
varying vec4 vColor;
uniform sampler2D depth_texture;
uniform sampler2D shadow_map0;
uniform sampler2D shadow_map1;
uniform sampler2D shadow_map2;
uniform sampler2D current_texture;
uniform float enable_lighting;
uniform float enable_texture;
@ -36,14 +40,14 @@ vec4 PhongShading(void)
return ambient+diffuse+specular;
}
float ShadowCoef(void){
vec3 shadow_coord = vShadowCoord.xyz / vShadowCoord.w;
float view = shadow_coord.z;
vec2 d[4];
float SampleShadow(sampler2D shadowMap, vec4 shadowCoord) {
vec3 shadow_c = shadowCoord.xyz / shadowCoord.w;
float view = shadow_c.z;
float shadow_coef = 1.0;
vec2 d[4];
int i;
if(shadow_coord.z > 1.0) return 1.0;
if(shadow_c.z > 1.0) return 1.0;
d[0] = vec2(-0.94201624, -0.39906216);
d[1] = vec2(0.94558609, -0.76890725);
@ -51,11 +55,11 @@ float ShadowCoef(void){
d[3] = vec2(0.34495938, 0.29387760);
for(i = 0; i < 4; i++){
vec2 p = shadow_coord.xy + d[i] / 700.0;
vec2 p = shadow_c.xy + d[i] / 700.0;
if(p.x < 0.0 || p.y < 0.0 || p.x > 1.0 || p.y > 1.0) shadow_coef += 1.0;
if(texture2D(depth_texture, p).z < view){
if(texture2D(shadowMap, p).z < view){
shadow_coef -= 0.2;
}
}
@ -63,6 +67,14 @@ float ShadowCoef(void){
return shadow_coef;
}
float ShadowCoef(void){
float dist = -vPos.z;
if(dist < 10.0) return SampleShadow(shadow_map0, vShadowCoord0);
if(dist < 40.0) return SampleShadow(shadow_map1, vShadowCoord1);
return SampleShadow(shadow_map2, vShadowCoord2);
}
void main(void){
vec4 c = PhongShading();
vec4 ambient = gl_LightSource[0].ambient;
@ -74,4 +86,4 @@ void main(void){
gl_FragColor = ambient * shadow_coef * c + (1.0 - ambient) * c;
gl_FragColor.a = vColor.a;
}
}

10
engine/data/shader/shadow.vs
View file

@ -2,17 +2,21 @@
varying vec4 vPos;
varying vec3 vNrm;
varying vec4 vShadowCoord;
varying vec4 vShadowCoord0;
varying vec4 vShadowCoord1;
varying vec4 vShadowCoord2;
varying vec4 vColor;
void main(void){
vPos = gl_ModelViewMatrix * gl_Vertex;
vNrm = normalize(gl_NormalMatrix * gl_Normal);
vShadowCoord = gl_TextureMatrix[7] * gl_ModelViewMatrix * gl_Vertex;
vShadowCoord0 = gl_TextureMatrix[5] * gl_ModelViewMatrix * gl_Vertex;
vShadowCoord1 = gl_TextureMatrix[6] * gl_ModelViewMatrix * gl_Vertex;
vShadowCoord2 = gl_TextureMatrix[7] * gl_ModelViewMatrix * gl_Vertex;
vColor = gl_Color;
gl_Position = gl_ProjectionMatrix * vPos;
gl_FrontColor = gl_Color;
gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
}
}